| Science & Engineering |
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| CHANGES IN SOIL BIOLOGICAL PROPERTIES WITH THE ADDITION OF METSULFURON-METHYL HERBICIDE |
| A. M. EL-ghamry, HUANG Chang-yong, XU Jian-ming, XIE Zheng-miao |
| College of Environmental and Resource Sciences, Department of Resource Science,Zhejiang University, Hangzhou 310029,China |
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Abstract An incubation study was conducted to investigate the effects of metsulfuron-methyl herbicide on the soil microbial biomass in loamy sand soil. The herbicide was applied to the soil at four concentrations: control, 0.01, 0.10, and 1.00 μg.g-1 soil. Determinations of microbial biomass-C and microbial biomass-N contents were carried out 1, 3, 5, 7, 10, 15, 25, and 45 days after herbicide application. In comparison to untreated soil, the microbial biomass-C and biomass-N decreased significantly in soils treated with herbicide at concentrations of 0.1 and 1.0 μg.g-1 soil within the first 7 days of incubation. The application of metsulfuron-methyl herbicide to the soil reduced the Cmic/Corg and Nmic/Ntotal percentages, which decreased with increasing application rate of metsulfuron-methyl herbicide. Compared to the untreated control, a marked increase in the microbial biomass C: N ratio was observed in the herbicide treated soil. This effect was transitory and was significant only at the higher rates of metsulfuron-methyl.
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Received: 12 June 1999
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